It's certainly a bitch to work with, but I've used it before. However I can't say I've used it all that much, so I'm sure it does have it's bugs. It definitely takes a bit of render time though, I feel you on that.
CS4 is kind of ridiculous when it comes to stability. I had always pirated in the past and attributed it's lack of stability to that, but I've been running a legitimate copy for almost a year now and it's still wack. Time to test out CS5 I suppose!